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Discussion Starter · #1 · (Edited)

I've only had my betta for a few days but have noticed that he has a lighter area on the back of his body/tail fin area.

Can anyone tell me what this is?

I've attached two pictures to show what I mean.


What size is your tank? 30 Litre
What temperature is your tank? 26C (79F)
Does your tank have a filter? Yes
Does your tank have an air stone or other type of aeration? No
Is your tank heated? Yes
What tank mates does your betta fish live with? None

What type of food do you feed your betta fish? Tetra Betta
How often do you feed your betta fish? Once or Twice per day

How often do you perform a water change? Every day or every other day (currently cycling)
What percentage of the water do you change when you perform a water change? 20%
What type of additives do you add to the water when you perform a water change? Tetra Aqua Safe (de-chlorine)

Water Parameters:
Have you tested your water? If so, what are the following parameters?

Ammonia: Between 0 and 0.25
Nitrite: 0
Nitrate: 20

Symptoms and Treatment
How has your betta fish's appearance changed? A couple of days
How has your betta fish's behavior changed? Not at all
When did you start noticing the symptoms? A couple of days
Have you started treating your fish? If so, how? None yet
Does your fish have any history of being ill? No
How old is your fish (approximately)?


Premium Member
23,299 Posts
It's just part of his iridescence is all. He's healthy :)
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